Scaling of the energy confinement time with β and collisionality approaching ITER conditions

J. G. Cordey; K. Thomsen; A. Chudnovskiy; O. J.W.F. Kardaun; T. Takizuka; J. A. Snipes; M. Greenwald; L. Sugiyama; F. Ryter; A. Kus; J. Stober; J. C. Deboo; C. C. Petty; G. Bracco; M. Romanelli; Z. Cui; Y. Liu; D. C. McDonald; A. Meakins; Y. Miura; K. Shinohara; K. Tsuzuki; Y. Kamada; H. Urano; M. Valovic; R. Akers; C. Brickley; A. Sykes; M. J. Walsh; S. M. Kaye; C. Bush; D. Hogewei; Y. Martin; A. Cote; G. Pacher; Jozef Ongena; F. Imbeaux; G. T. Hoang; S. Lebedev; V. Leonov

doi:10.1088/0029-5515/45/9/007

Scaling of the energy confinement time with β and collisionality approaching ITER conditions

J. G. Cordey, K. Thomsen, A. Chudnovskiy, O. J.W.F. Kardaun, T. Takizuka, J. A. Snipes, M. Greenwald, L. Sugiyama, F. Ryter, A. Kus, J. Stober, J. C. Deboo, C. C. Petty, G. Bracco, M. Romanelli, Z. Cui, Y. Liu, D. C. McDonald, A. Meakins, Y. MiuraK. Shinohara, K. Tsuzuki, Y. Kamada, H. Urano, M. Valovic, R. Akers, C. Brickley, A. Sykes, M. J. Walsh, S. M. Kaye, C. Bush, D. Hogewei, Y. Martin, A. Cote, G. Pacher, Jozef Ongena, F. Imbeaux, G. T. Hoang, S. Lebedev, V. Leonov

Laboratory for Plasma Physics

Research output: Contribution to journal › Article › peer-review

Abstract

The condition of the latest version of the ELMy H-mode database has been re-examined. It is shown that there is bias in the ordinary least squares regression for some of the variables. To address these shortcomings three different techniques are employed: (a) principal component regression, (b) an error in variables technique and (c) the selection of a better conditioned dataset with fewer variables. Scalings in terms of the dimensionless physics variables, as well as the standard set of engineering variables, are also derived. The new scalings give a very similar performance for existing scalings for ITER at the standard β_n of 1.6, but a much improved performance at higher β_n.

Original language	English
Pages (from-to)	1078-1084
Number of pages	7
Journal	Nuclear Fusion
Volume	45
Issue number	9
DOIs	https://doi.org/10.1088/0029-5515/45/9/007
Publication status	Published - 1 Sept 2005

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Cordey, J. G., Thomsen, K., Chudnovskiy, A., Kardaun, O. J. W. F., Takizuka, T., Snipes, J. A., Greenwald, M., Sugiyama, L., Ryter, F., Kus, A., Stober, J., Deboo, J. C., Petty, C. C., Bracco, G., Romanelli, M., Cui, Z., Liu, Y., McDonald, D. C., Meakins, A., ... Leonov, V. (2005). Scaling of the energy confinement time with β and collisionality approaching ITER conditions. Nuclear Fusion, 45(9), 1078-1084. https://doi.org/10.1088/0029-5515/45/9/007

@article{03658e0f2de749848e153dba118de497,

title = "Scaling of the energy confinement time with β and collisionality approaching ITER conditions",

abstract = "The condition of the latest version of the ELMy H-mode database has been re-examined. It is shown that there is bias in the ordinary least squares regression for some of the variables. To address these shortcomings three different techniques are employed: (a) principal component regression, (b) an error in variables technique and (c) the selection of a better conditioned dataset with fewer variables. Scalings in terms of the dimensionless physics variables, as well as the standard set of engineering variables, are also derived. The new scalings give a very similar performance for existing scalings for ITER at the standard βn of 1.6, but a much improved performance at higher βn.",

author = "Cordey, \{J. G.\} and K. Thomsen and A. Chudnovskiy and Kardaun, \{O. J.W.F.\} and T. Takizuka and Snipes, \{J. A.\} and M. Greenwald and L. Sugiyama and F. Ryter and A. Kus and J. Stober and Deboo, \{J. C.\} and Petty, \{C. C.\} and G. Bracco and M. Romanelli and Z. Cui and Y. Liu and McDonald, \{D. C.\} and A. Meakins and Y. Miura and K. Shinohara and K. Tsuzuki and Y. Kamada and H. Urano and M. Valovic and R. Akers and C. Brickley and A. Sykes and Walsh, \{M. J.\} and Kaye, \{S. M.\} and C. Bush and D. Hogewei and Y. Martin and A. Cote and G. Pacher and Jozef Ongena and F. Imbeaux and Hoang, \{G. T.\} and S. Lebedev and V. Leonov",

year = "2005",

month = sep,

day = "1",

doi = "10.1088/0029-5515/45/9/007",

language = "English",

volume = "45",

pages = "1078--1084",

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Cordey, JG, Thomsen, K, Chudnovskiy, A, Kardaun, OJWF, Takizuka, T, Snipes, JA, Greenwald, M, Sugiyama, L, Ryter, F, Kus, A, Stober, J, Deboo, JC, Petty, CC, Bracco, G, Romanelli, M, Cui, Z, Liu, Y, McDonald, DC, Meakins, A, Miura, Y, Shinohara, K, Tsuzuki, K, Kamada, Y, Urano, H, Valovic, M, Akers, R, Brickley, C, Sykes, A, Walsh, MJ, Kaye, SM, Bush, C, Hogewei, D, Martin, Y, Cote, A, Pacher, G, Ongena, J, Imbeaux, F, Hoang, GT, Lebedev, S & Leonov, V 2005, 'Scaling of the energy confinement time with β and collisionality approaching ITER conditions', Nuclear Fusion, vol. 45, no. 9, pp. 1078-1084. https://doi.org/10.1088/0029-5515/45/9/007

TY - JOUR

T1 - Scaling of the energy confinement time with β and collisionality approaching ITER conditions

AU - Cordey, J. G.

AU - Thomsen, K.

AU - Chudnovskiy, A.

AU - Kardaun, O. J.W.F.

AU - Takizuka, T.

AU - Snipes, J. A.

AU - Greenwald, M.

AU - Sugiyama, L.

AU - Ryter, F.

AU - Kus, A.

AU - Stober, J.

AU - Deboo, J. C.

AU - Petty, C. C.

AU - Bracco, G.

AU - Romanelli, M.

AU - Cui, Z.

AU - Liu, Y.

AU - McDonald, D. C.

AU - Meakins, A.

AU - Miura, Y.

AU - Shinohara, K.

AU - Tsuzuki, K.

AU - Kamada, Y.

AU - Urano, H.

AU - Valovic, M.

AU - Akers, R.

AU - Brickley, C.

AU - Sykes, A.

AU - Walsh, M. J.

AU - Kaye, S. M.

AU - Bush, C.

AU - Hogewei, D.

AU - Martin, Y.

AU - Cote, A.

AU - Pacher, G.

AU - Ongena, Jozef

AU - Imbeaux, F.

AU - Hoang, G. T.

AU - Lebedev, S.

AU - Leonov, V.

PY - 2005/9/1

Y1 - 2005/9/1

N2 - The condition of the latest version of the ELMy H-mode database has been re-examined. It is shown that there is bias in the ordinary least squares regression for some of the variables. To address these shortcomings three different techniques are employed: (a) principal component regression, (b) an error in variables technique and (c) the selection of a better conditioned dataset with fewer variables. Scalings in terms of the dimensionless physics variables, as well as the standard set of engineering variables, are also derived. The new scalings give a very similar performance for existing scalings for ITER at the standard βn of 1.6, but a much improved performance at higher βn.

AB - The condition of the latest version of the ELMy H-mode database has been re-examined. It is shown that there is bias in the ordinary least squares regression for some of the variables. To address these shortcomings three different techniques are employed: (a) principal component regression, (b) an error in variables technique and (c) the selection of a better conditioned dataset with fewer variables. Scalings in terms of the dimensionless physics variables, as well as the standard set of engineering variables, are also derived. The new scalings give a very similar performance for existing scalings for ITER at the standard βn of 1.6, but a much improved performance at higher βn.

UR - https://www.scopus.com/pages/publications/24344497812

U2 - 10.1088/0029-5515/45/9/007

DO - 10.1088/0029-5515/45/9/007

M3 - Article

AN - SCOPUS:24344497812

SN - 0029-5515

VL - 45

SP - 1078

EP - 1084

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 9

ER -

Scaling of the energy confinement time with β and collisionality approaching ITER conditions

Abstract

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